Aquatic macrophytes are potential useful for phytoremediation programs in environments contaminated by arsenic (As). Biochemical and physiological modification analyses in different plant parts are important to understand As tolerance mechanisms. 2. The objective was to evaluate glutathione metabolism in leaves and roots of Eichhornia crassipes (Mart.) Solms plants subjected to As. Specimens of Eichhornia crass...
This study aimed to anatomically characterize the extrafloral nectaries (EFNs) of annatto (Bixa orellana) and determine the composition of its nectar in order to better understand their structure and function during organ development. Standard light and scanning electron microscopy techniques were used for anatomical analysis, and test-strips and a refractometer for determining nectar composition. Both receptac...
O cultivo consorciado pode levar ao sombreamento de uma das culturas acarretando alterações morfológicas externas e internas e na produtividade da cultura sombreada. O taro [Colocasia esculenta (L.) Schott], é uma Araceae de ciclo cultural longo, o que dificulta seu cultivo em propriedades com limitação de área. A associação do taro com outras culturas é uma opção para situações dessa natureza; todavia, definir...
This work aims to investigate the origins and development of secretory cells in Piper umbellatum (L.) Miq. (Piperaceae) leaves as well as the course and the nature of their secretion. The results were compared with studies in oil-secreting cells of several species. Fully expanded fresh leaves were sectioned and subjected to different histochemical tests. Leaves in different developmental stages were fixed and p...
In this work the leaf anatomy of three species of Ficus section Americanae (Miq.) Miq. from Brazil, whose leaves and latex are used in folk medicine is reported. The work was carried out using light and scanning electron microscopy in order to characterize these species and to evaluate their taxonomic significance, and also contribute to the quality control of their ethnodrugs. The three species (Ficus cyclophy...
As características morfológicas, estruturais e a produção de matéria seca (PMS) do capim-braquiária (Brachiaria decumbens, cv. Basilisk) e do amendoim forrageiro (Arachis pintoi, cv. Amarillo) foram avaliadas em resposta a três níveis de sombreamento artificial (0, 50 e 70%). Utilizou-se o delineamento em blocos casualizados, com três repetições. Foram realizados três e dois cortes, respectivamente, para avalia...
This paper describes the development of colleters of Bathysa cuspidata, Rubiaceae, considering anatomical, histochemical and ultrastructural aspects and going from first differentiation stages until senescence. Further, the chemical composition of the secretion is investigated. The samples were prepared according to the usual techniques for light microscopy and scanning and transmission electron microscopy. Ele...
Este trabalho procurou correlacionar dados de observações em microscopia de luz através de técnicas histoquímicas e de luz polarizada e investigações em microscopia eletrônica de transmissão para caracterizar os materiais de reserva em cotilédones de C. peltophoroides Benth. (Leguminosae-Caesalpinoideae), conhecida popularmente como sibipiruna, ou falso pau-brasil, uma espécie tropical com ampla distribuição no...
Abundant evidence exists to support a role for lignin as an important element in biomass recalcitrance. However, several independent studies have also shown that factors apart from lignin are also relevant and overall, the relative importance of different recalcitrance traits remains in dispute. In this study we used two genetically distant sugarcane genotypes, and performed a correlational study with the varia...
Este trabalho teve como objetivo estudar a mobilização de reservas de sementes de Caesalpinia peltophoroides Benth. durante a germinação e crescimento inicial das plântulas. As variações nas reservas de carbiodratos, lipídios e proteínas foram analisadas desde o período pré-germinativo (0 a 5 dias após a semeadura – DAS) até a total senescência e abscisão dos cotilédones, aos 35 DAS, por meio de testes bioquími...